package com.xxxx.server.config.security;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * JWT登录授权过滤器
 *
 * @author zhoubin
 * @since 1.0.0
 */
public class JwtAuthencationTokenFilter extends OncePerRequestFilter {

	@Value("${jwt.tokenHeader}")
	private String tokenHeader;
	@Value("${jwt.tokenHead}")
	private String tokenHead;
	@Autowired
	private JwtTokenUtil jwtTokenUtil;
	@Autowired
	private UserDetailsService userDetailsService;

	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
		String authHeader = request.getHeader(this.tokenHeader);
		//存在token
		//System.out.println(tokenHeader+" "+authHeader);
		if (null != authHeader && authHeader.startsWith(this.tokenHead)) {
			String authToken = authHeader.substring(this.tokenHead.length());
			String username = jwtTokenUtil.getUserNameFromToken(authToken);
			//token中存在用户名但未登录
			if (null!=username&& null== SecurityContextHolder.getContext().getAuthentication()){
				//登录

				UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
				//验证token是否有效，重新设置用户对象
				if (jwtTokenUtil.volidateToken(authToken,userDetails)){
					//System.out.println("登录");
					UsernamePasswordAuthenticationToken authentication =
							new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
					authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
					SecurityContextHolder.getContext().setAuthentication(authentication);
				//	System.out.println("重新设置");
				}
			}
		}
		filterChain.doFilter(request,response);
	}
}